Apparatus for calibrating hollow nonsymmetrical multiplane extrusions and associated method
US5595086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1994 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Aug 2, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C35/03
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for calibrating a nonsymmetrical hollow article includes a plurality of internal die elements which are inserted into the hollow article and are expanded by a tapered plunger so as to outwardly reform the hollow article into the desired size and shape. An external die restrains the outer surface of the portion of the hollow article during reforming. The apparatus is also usable on hollow articles which do not have a linear longitudinal axis. The surface to surface engagement between internal die members creates an interface which is preferably generally aligned with straight portions of the inner surface of the hollow article except for internal corners of the article. Corresponding methods are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.